diff options
| author | Sebastian Ott <sebott@linux.vnet.ibm.com> | 2014-12-05 18:41:47 +0300 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2014-12-08 11:42:44 +0300 |
| commit | de88d0d28fe932637eb5b7ebf9e638256cf07979 (patch) | |
| tree | 832876b01901d8c29c09ea170bc69f8dacfec25d /drivers/s390/block/scm_blk_cluster.c | |
| parent | 9d4df77fab7347a74a9938521ffad8d8fab2671d (diff) | |
| download | linux-de88d0d28fe932637eb5b7ebf9e638256cf07979.tar.xz | |
s390/scm_block: allocate aidaw pages only when necessary
AOBs (the structure describing the HW request) need to be 4K
aligned but very little of that page is actually used. With
this patch we place aidaws at the end of the AOB page and only
allocate a separate page for aidaws when we have to (lists of
aidaws must not cross page boundaries).
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/block/scm_blk_cluster.c')
| -rw-r--r-- | drivers/s390/block/scm_blk_cluster.c | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/drivers/s390/block/scm_blk_cluster.c b/drivers/s390/block/scm_blk_cluster.c index 4787f80e5537..2fd01320b978 100644 --- a/drivers/s390/block/scm_blk_cluster.c +++ b/drivers/s390/block/scm_blk_cluster.c @@ -131,16 +131,9 @@ static int scm_prepare_cluster_request(struct scm_request *scmrq) scmrq->cluster.state = CLUSTER_READ; /* fall through */ case CLUSTER_READ: - aidaw = scm_aidaw_alloc(); - if (!aidaw) - return -ENOMEM; - - memset(aidaw, 0, PAGE_SIZE); - scmrq->aob->request.msb_count = 1; msb->bs = MSB_BS_4K; msb->oc = MSB_OC_READ; msb->flags = MSB_FLAG_IDA; - msb->data_addr = (u64) aidaw; msb->blk_count = write_cluster_size; addr = scmdev->address + ((u64) blk_rq_pos(req) << 9); @@ -151,6 +144,12 @@ static int scm_prepare_cluster_request(struct scm_request *scmrq) CLUSTER_SIZE)) msb->blk_count = 2 * write_cluster_size; + aidaw = scm_aidaw_fetch(scmrq, msb->blk_count * PAGE_SIZE); + if (!aidaw) + return -ENOMEM; + + scmrq->aob->request.msb_count = 1; + msb->data_addr = (u64) aidaw; for (i = 0; i < msb->blk_count; i++) { aidaw->data_addr = (u64) scmrq->cluster.buf[i]; aidaw++; |